In order to know which one is the main camera and apply different behaviors to it, Game Creator provides a component called Camera Controller.
Game Creator has two different Camera types:
Camera Controller: Attached to the main camera. Mimics the behavior of an active Camera Motor.
Camera Motors: There are different types of motors. They tell the Camera Controller where to look.
The Camera Controller has a slot with a reference to an active Camera Motor. The Camera Controller tries to mimic the referenced motor properties.
The Camera Controller also has dampening options in case you constantly switch between different motors and you want to smooth out the different transitions.
There are different types of Camera Motors. Each one of them is responsible for a specific logic. Some are very simple, like the Fixed Camera Motor, which only rotates towards a target. Others, like the Adventure Camera Motor allow you orbit around a character while avoiding walls getting in the way.
Click here for a more in-depth view of the different Camera Motors
To create a Camera Motor right click on the Hierarchy Panel and select
Game Creator → Other → Camera Motor.